A) Protozoa
B) Cnidaria
C) Platyhelminthes
D) Arthropoda
Correct Answer: B
Solution :
Cnidarians are among those very few animals, which show the phenomenon of polymorphism, ie, occurrence of more than one type of individuals in the same species. These individuals differ in form and function and seen differentially in different species of the phylum. The patterns of polymorphism begin with dimorphic organization in the phylum and reaches to the polymorphic organization. The two basic forms are polyp and medusa. The classification of phylum also has these two forms in its basis.
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